diff --git a/homeassistant/components/lametric/const.py b/homeassistant/components/lametric/const.py
index 1ba48e0d992..6a3df3b54f1 100644
--- a/homeassistant/components/lametric/const.py
+++ b/homeassistant/components/lametric/const.py
@@ -7,7 +7,7 @@ from typing import Final
 from homeassistant.const import Platform
 
 DOMAIN: Final = "lametric"
-PLATFORMS = [Platform.BUTTON, Platform.NUMBER, Platform.SWITCH]
+PLATFORMS = [Platform.BUTTON, Platform.NUMBER, Platform.SENSOR, Platform.SWITCH]
 
 LOGGER = logging.getLogger(__package__)
 SCAN_INTERVAL = timedelta(seconds=30)
diff --git a/homeassistant/components/lametric/sensor.py b/homeassistant/components/lametric/sensor.py
new file mode 100644
index 00000000000..b9ff430ab2b
--- /dev/null
+++ b/homeassistant/components/lametric/sensor.py
@@ -0,0 +1,87 @@
+"""Support for LaMetric sensors."""
+from __future__ import annotations
+
+from collections.abc import Callable
+from dataclasses import dataclass
+
+from demetriek import Device
+
+from homeassistant.components.sensor import (
+    SensorEntity,
+    SensorEntityDescription,
+    SensorStateClass,
+)
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import PERCENTAGE
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.entity import EntityCategory
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+
+from .const import DOMAIN
+from .coordinator import LaMetricDataUpdateCoordinator
+from .entity import LaMetricEntity
+
+
+@dataclass
+class LaMetricEntityDescriptionMixin:
+    """Mixin values for LaMetric entities."""
+
+    value_fn: Callable[[Device], int | None]
+
+
+@dataclass
+class LaMetricSensorEntityDescription(
+    SensorEntityDescription, LaMetricEntityDescriptionMixin
+):
+    """Class describing LaMetric sensor entities."""
+
+
+SENSORS = [
+    LaMetricSensorEntityDescription(
+        key="rssi",
+        name="Wi-Fi signal",
+        icon="mdi:wifi",
+        entity_category=EntityCategory.DIAGNOSTIC,
+        entity_registry_enabled_default=False,
+        native_unit_of_measurement=PERCENTAGE,
+        state_class=SensorStateClass.MEASUREMENT,
+        value_fn=lambda device: device.wifi.rssi,
+    ),
+]
+
+
+async def async_setup_entry(
+    hass: HomeAssistant,
+    entry: ConfigEntry,
+    async_add_entities: AddEntitiesCallback,
+) -> None:
+    """Set up LaMetric sensor based on a config entry."""
+    coordinator: LaMetricDataUpdateCoordinator = hass.data[DOMAIN][entry.entry_id]
+    async_add_entities(
+        LaMetricSensorEntity(
+            coordinator=coordinator,
+            description=description,
+        )
+        for description in SENSORS
+    )
+
+
+class LaMetricSensorEntity(LaMetricEntity, SensorEntity):
+    """Representation of a LaMetric sensor."""
+
+    entity_description: LaMetricSensorEntityDescription
+
+    def __init__(
+        self,
+        coordinator: LaMetricDataUpdateCoordinator,
+        description: LaMetricSensorEntityDescription,
+    ) -> None:
+        """Initiate LaMetric sensor."""
+        super().__init__(coordinator)
+        self.entity_description = description
+        self._attr_unique_id = f"{coordinator.data.serial_number}-{description.key}"
+
+    @property
+    def native_value(self) -> int | None:
+        """Return the sensor value."""
+        return self.entity_description.value_fn(self.coordinator.data)
diff --git a/tests/components/lametric/test_sensor.py b/tests/components/lametric/test_sensor.py
new file mode 100644
index 00000000000..76f584b1cde
--- /dev/null
+++ b/tests/components/lametric/test_sensor.py
@@ -0,0 +1,54 @@
+"""Tests for the LaMetric sensor platform."""
+from unittest.mock import AsyncMock, MagicMock
+
+from homeassistant.components.lametric.const import DOMAIN
+from homeassistant.components.sensor import ATTR_STATE_CLASS, SensorStateClass
+from homeassistant.const import (
+    ATTR_DEVICE_CLASS,
+    ATTR_FRIENDLY_NAME,
+    ATTR_ICON,
+    ATTR_UNIT_OF_MEASUREMENT,
+    PERCENTAGE,
+)
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers import device_registry as dr, entity_registry as er
+from homeassistant.helpers.entity import EntityCategory
+
+from tests.common import MockConfigEntry
+
+
+async def test_wifi_signal(
+    hass: HomeAssistant,
+    entity_registry_enabled_by_default: AsyncMock,
+    init_integration: MockConfigEntry,
+    mock_lametric: MagicMock,
+) -> None:
+    """Test the LaMetric Wi-Fi sensor."""
+    device_registry = dr.async_get(hass)
+    entity_registry = er.async_get(hass)
+
+    state = hass.states.get("sensor.frenck_s_lametric_wi_fi_signal")
+    assert state
+    assert state.attributes.get(ATTR_DEVICE_CLASS) is None
+    assert state.attributes.get(ATTR_FRIENDLY_NAME) == "Frenck's LaMetric Wi-Fi signal"
+    assert state.attributes.get(ATTR_ICON) == "mdi:wifi"
+    assert state.attributes.get(ATTR_STATE_CLASS) is SensorStateClass.MEASUREMENT
+    assert state.attributes.get(ATTR_UNIT_OF_MEASUREMENT) == PERCENTAGE
+    assert state.state == "21"
+
+    entry = entity_registry.async_get(state.entity_id)
+    assert entry
+    assert entry.device_id
+    assert entry.entity_category is EntityCategory.DIAGNOSTIC
+    assert entry.unique_id == "SA110405124500W00BS9-rssi"
+
+    device = device_registry.async_get(entry.device_id)
+    assert device
+    assert device.configuration_url is None
+    assert device.connections == {(dr.CONNECTION_NETWORK_MAC, "aa:bb:cc:dd:ee:ff")}
+    assert device.entry_type is None
+    assert device.hw_version is None
+    assert device.identifiers == {(DOMAIN, "SA110405124500W00BS9")}
+    assert device.manufacturer == "LaMetric Inc."
+    assert device.name == "Frenck's LaMetric"
+    assert device.sw_version == "2.2.2"